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A171010 Number of ways to place two non-attacking kings on all free n-ominoes. 0

%I

%S 0,0,1,7,46,240,1207,6004,28903,137996

%N Number of ways to place two non-attacking kings on all free n-ominoes.

%e E.g. the triomino XXX admits 1 combination of 2 non-attacking kings.

%K nonn

%O 1,4

%A _David Scambler_, Aug 27 2010

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Last modified October 28 10:46 EDT 2020. Contains 338054 sequences. (Running on oeis4.)